Summary

The Challenge

In regulatory compliance, LLM hallucinations are legal liabilities. Standard RAG forces answers even with weak context. Unacceptable for GST tax laws.

The Strategic Solution

Built 'Failure-Aware' RAG. Doesn't just retrieve—audits itself. Abstention Gate refuses low-confidence queries. Faithfulness Verifier checks every claim against source before delivery.

Technical Implementation

Breakthrough: deterministic refusal. Custom Confidence Scorer factors retriever agreement + term coverage. 1.0 faithfulness + HIGH confidence = delivery. Otherwise, graceful abstention.